A primary source is a document or physical object which was written or created during the time under study.
A secondary source interprets and analyzes primary sources.
A tertiary source indexes, abstracts, organizes, compiles, or digests other sources.
List of primary, secondary and tertiary sources compiled by the University of Minnesota.
Primary, Secondary, & Tertiary Sources' video by Suffolk County Community College Library
Journal articles are typically referred to as "scholarly," while magazine articles are usually considered "popular". A third category, "trade" magazines or journals, are written for professionals in a particular field but are not strictly research related.
Refer to the Colorado State University Libraries website on the differences
Scholarly vs. Popular Articles video by Georgia State University Library